How to make it

Bake cake mix according to package directions using a rectangular baking pan. Cool 10 minutes in pan then cut in half. Carefully remove pieces from pan and cool thoroughly on a rack. When cake is cool trim pieces to match the size of the ice cream package using the larger side. (Remember to measure package as some brands are slightly larger than others). With a piece of thread or fine string slice pieces of cake in half through the middle so that you have four layers.

Remove ice cream from package and place on a cutting board. Quickly using a clean sharp slicing knife slice two layers of ice cream the same width as the cake layers. Immediately wrap remaining ice cream in plastic on a baking sheet or tray and return to the freezer. Working very quickly set one layer of cake on a tray lined with plastic wrap then cover with one layer of ice cream.

Repeat the process topping with a layer of cake.

Store the assembled cake and ice cream layers in the freezer while you prepare the whipped cream.